[Wrapper-user] Fwd: Jar works with console, throws exceptions when launched via start?

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Hi Leif.

Any comment on the below?

Regards.

---------- Forwarded message ----------
From: Stas Oskin <sta...@gm...>
Date: 2008/10/5
Subject: Re: [Wrapper-user] Jar works with console, throws exceptions when
launched via start?
To: ‏wra...@li...‏

Hi Lee.

You mean that the wrapper actually gets a higher priority then the JVM it
launches?

Regards.

2008/10/5 Leif Mortenson <le...@ta...>

Stas,
> I was able to to check the default priorities using the following command:
> ps -eo pid,tid,class,rtprio,ni,pri,psr,pcpu,stat,wchan:14,comm
>
> On Ubuntu, the Wrapper is defaulting to a nice level of 0 and a
> real-time priority of 24, but the JVM is set to a nice level of 0 and
> a real-time priority of 19.
> According to the nice manual however, the range of possible values is
> -20 (most favorable) to 19 (least favorable)
>
> If I set the PRIORITY in the script to 5 then the nice levels both get
> set to 5, but the real-time priorities are 19 and 15 respectively.
> This is actually lower priority.
> Setting priorities to a value higher than 0 requires root privilege.
>
> If do so and set it to -5, then the nice levels are both -5, and the
> real-time priorities are 29 and 26 respectively.
>
> So quick answer, the default is 0.   I need to look into the real-time
> priority more on my end.   you are probable seeing the lower priority
> do to this difference in real-time priorities between the top level
> wrapper process and its child java process.  I had not noticed this
> before.
>
> Cheers,
> Leif
>
> On Wed, Oct 1, 2008 at 11:30 PM, Stas Oskin <sta...@gm...> wrote:
> > Hi Leif.
> >
> > Thanks, I see.
> >
> > Do you have any idea how to find current priority level (so I could
> increase
> > 1 by 1).
> >
> > Regards.
> >
> > 2008/10/1 Leif Mortenson <le...@ta...>
> >>
> >> Stas,
> >> On linux, open your wrapper shell script in an editor and modify the
> >> PRIORITY value found in the settings section towards the top.  These
> >> are standard nice levels, so look at "man nice" for details.
> >>
> >> Cheers,
> >> Leif
> >>
> >> On Wed, Oct 1, 2008 at 9:44 PM, Stas Oskin <sta...@gm...>
> wrote:
> >> > Hi Leif.
> >> >
> >> > 2008/10/1 Leif Mortenson <le...@ta...>
> >> >>
> >> >> Stas,
> >> >> That's great news.   The memory leaks were in the Java code?  What
> are
> >> >> you maximum memory settings set to?  Are they low enough that the
> >> >> entire JVM will fit in memory without any swapping along side the OS
> >> >> and other apps being used?  Java performs very poorly when its memory
> >> >> is being swapped out. (Not a Wrapper issue)
> >> >
> >> > The leaks were in JNI code and quickly took the whole memory. This
> >> > caused
> >> > Java to swap.
> >> >
> >> >>
> >> >> About the CPU, I reread this thread but I don't think you ever told
> me
> >> >> what platform you are running on.  That will make a big difference.
> >> >> Under UNIX, there is a setting in the shell script which allows you
> to
> >> >> specify a "nice" level to control the priority.
> >> >
> >> > We use Linux - CentOS distro. What setting we should look to?
> >> >
> >> >>
> >> >> On Windows, it is done using the
> >> >> wrapper.ntservice.process_priority=NORMAL property.  Please be sure
> to
> >> >> read the warnings in the documentation.
> >> >>
> >> >>
> >> >>
> http://wrapper.tanukisoftware.org/doc/english/prop-ntservice-process-priority.html
> >> >>
> >> >> Normally on most platforms, the OS gives priority to the Windowing
> >> >> system and those processes to make them more responsive.  That is why
> >> >> on UNIX, it is good to run servers in a headless environment.
> >> >
> >> > Hmm, we running the server without any X installed, strictly via
> console
> >> > -
> >> > is this what you call headless?
> >> >
> >> > Actually, this is the main app the server was targeted to, so we
> indeed
> >> > prefer to give it all the priority we can (without hanging the OS of
> >> > course).
> >> >
> >> > Regards.
> >> >
> >> >
> >> >
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